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1966 4Door Cutlass Suprrme Hard Top

Old March 3rd, 2019, 11:04 PM
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1966 4Door Cutlass Suprrme Hard Top



My new Baby
Hello Oldsmobile Owners.🤔 I just purchased a Ď66 4 door cutlass supreme with a 425 Ultra High Compression engine 2 days ago. Oh! My name is Danny. My friends just use D. Any way is good with me. I live in NE North Carolina... (back to the car) I traveled 1200 miles round trip to get it, not knowing really what I was getting, besides the photos I had, and a little information. The car was purchased new but this personís mother way back then, and they kept it in the garage most of the time. It only has 68,000 miles on it and no major rust in the pans (floors-rear trunk). I got up this morning with intentions of cleaning it up a little bit and just seeing what I have. The battery was dead so I jumped it out... Vroom! Vroom! It fired right up. It had been sitting a long time. Bad gas and all, it runs!!! I have a lot of work to do and just joined this forum today, but I am looking forward to this project... I will entertain any advise, and technical support you guys/gals can offer.
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Last edited by MuchNeededAdvice; March 3rd, 2019 at 11:06 PM. Reason: Misspelled word
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Old March 4th, 2019, 01:52 AM
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Cingrats on your purchase😀 Lemme be the first to welcome you to the group. This place has a wealth of info and everyone is great about jumping in with advice, tips and "been there, done that."

BTW, where in NE NC do you call home?

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Old March 4th, 2019, 03:50 AM
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More pictures are needed! You don't see many 4dr cars driving around. By the way the 425 was not available on the Cutlass. If that's the engine in there someone swapped it.
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Old March 4th, 2019, 04:37 AM
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I live in Gates County North Carolina. The man I got the car from is around 80 years+... All I have at this point is to go with a mans word, and he seemed to be a good guy. The car came from Cedartown Ga. The research I have been doing shows that motor as an option in the 88ís and another vehicle,so maybe they had a special order or something. All I know is we will find out with more research (bend numbers- motor codes) etc... Thanks for the welcome
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Old March 4th, 2019, 06:14 AM
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Welcome. Be aware that the 425 was never installed in the Cutlass line, so if that really is a 425, someone swapped it in there. The 1966 Supreme was only offered with the 330 motor. 1966 was the first year for the Supreme nameplate, and it was only available in a four door hardtop (Holiday Sedan in Oldsmo-speak) that year. Good luck with it.
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Old March 4th, 2019, 06:27 AM
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Welcome to the site and congrats. Nice more door.
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Old March 4th, 2019, 09:44 AM
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Ok hereís the scoop...According to the vin #ís, it is an Oldsmobile with. Cutlass Supreme V8.It is a Holiday 4Door Sedan. Was manufactured in 1966, in Lansing Michigan, and was# 430270 in production...I have yet to get the motor numbers but Iím a bet it is a 425.
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Old March 4th, 2019, 10:29 AM
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Looks good, I like!! Welcome!
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Old March 4th, 2019, 01:58 PM
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Thank you for the welcome.😁
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Old March 4th, 2019, 05:34 PM
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Ok so I found the #4 on the heads. Seems the old fellow may have been wishing he had a 425. If I was betting on this,I would have lost big time... Anyways a 330 doesnít slow me down any, because I am still stoked on the car. The two speed transmission might leave me wanting another gear once I get it on the road. He did contact me today and the title process is in the works. North Carolina from what I am reading, can be a booger to work with DMV and classic cars. Thanks for the information, and I look forward to more input as I go on.😁👍
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Old March 6th, 2019, 06:28 AM
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I believe a 66 330 should have #3 heads originally. Number 4 heads were on the 67's. Not going to say "I told you so" on the 425 so I wont...lol. If you post a picture of the trim tag on the firewall we can see build date.
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Old March 6th, 2019, 06:56 AM
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This wouldn't be the first time that someone claimed that a small block Olds was a big block...

The two speed Jetaway (which has nothing in common with a Powerglide) does have the switch pitch torque converter. A TH350 is nearly a bolt-in and is a popular swap.
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Old March 6th, 2019, 08:21 AM
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Originally Posted by MuchNeededAdvice View Post
North Carolina from what I am reading, can be a booger to work with DMV and classic cars.
FWIW, I reside in Carteret County, you reside in Gates County - both in NC. I purchased my clear title vehicle (1971 CS) in July 2018 in NC; and, the registration/plates went through flawlessly within about one week - no issues at all. Hopefully you'll have no issues with your 1966.
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Old March 6th, 2019, 12:24 PM
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Another way to tell is to look down around where the oil fill tube goes into the block there's numbers:ID/ Casting
Code Year(s) CID Number Notes
A '65 425 381917?? 1st year, big cars.
386525
D '66 - '67 425 389244 Big-car engine. Toro is different internally.

If it is one of these, like the rest said its a transplant..
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Old March 6th, 2019, 12:28 PM
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Originally Posted by therobski View Post
Another way to tell is to look down around where the oil fill tube goes into the block there's numbers:ID/ Casting
Code Year(s) CID Number Notes
A '65 425 381917?? 1st year, big cars.
386525
D '66 - '67 425 389244 Big-car engine. Toro is different internally.

If it is one of these, like the rest said its a transplant..
Yeah, but don't copy/paste from the FAQ and expect it to be 100% correct...

(Hint: 381917 is a 330 block, not a 425)
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Old March 6th, 2019, 01:27 PM
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Your right about that Joe. Thanks for the reminder....
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Old March 6th, 2019, 02:58 PM
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So hereís the trim plate... Getting down to the numbers on the block is going to be a booger right now, until I get it jacked up.The weather is bad here. Rain every weekend, and the breaks donít work. I think the booster is trying to pump up but the master cylinder needs a rebuild kit...I think I will enjoy working on this fine piece of equipment. Something that doesnít need a computer programmer to service for a change... A couple of things I have found: The heat works great, but the fan only works on high speed. The voltage regulator stays engaged when I cut it off, until I disconnect the battery and connect it back...Last time this car had tags on it was around 2000. Thanks for the input and advice.
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Old March 6th, 2019, 03:09 PM
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[color=left=#000000]6M430270 VIN sequence
& 07D - July 4th week body
makes this one LATE production 1966 Oldsmobile
I'd bet the #4 heads are originals

got more pics?[/color]
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Old March 6th, 2019, 03:11 PM
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The block casting number is on top - you don't need to jack it up.

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Old March 6th, 2019, 03:30 PM
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The car is green...
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Old March 6th, 2019, 03:30 PM
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Welcome to the group... Nice find... You must be pleased with all the great info available here to help answer any questions you may have...
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Old March 6th, 2019, 03:38 PM
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Thanks for the compliment. I did have to drive 1250 miles to get it, and YES I am learning more every day...
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Old March 6th, 2019, 03:49 PM
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Looks like the #s are 381s17 A1
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Old March 6th, 2019, 03:53 PM
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Originally Posted by MuchNeededAdvice View Post
Looks like the #s are 381s17 A1
Look again, that's 381917, which is the 330 we all thought it was. That's the only motor factory installed in the 1966 Supreme.
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Old March 6th, 2019, 03:58 PM
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Yeah l am still pleased. I was told it was all original. I would like to keep it that way at least for a while...with towing I still donít have 4K in the car.
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Old March 6th, 2019, 04:09 PM
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Go Here>>> Learn Stuff>>> 1966 Oldsmobile

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Old March 6th, 2019, 04:22 PM
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My favorite 66 color Ocean Mist.... your trim tag shows k-2

k (Ocean Mist) and 2 ( black vinyl top ) although it looks like that was changed to full body color of Ocean Mist

at some time.
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Old March 6th, 2019, 04:23 PM
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Originally Posted by MuchNeededAdvice View Post
The car is green...
The color code for your vehicle is 'K' = Ocean Mist
I'm sure it took every minute of several waking hours drinking several gallons of Margaritas to arrive at the name Ocean Mist.
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Old March 6th, 2019, 04:25 PM
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Originally Posted by lunaboy View Post
My favorite 66 color Ocean Mist.... your trim tag shows k-2

k (Ocean Mist) and 2 ( black vinyl top ) although it looks like that was changed to full body color of Ocean Mist

at some time.
^^x2^^ (except - not my favorite color)
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Old March 6th, 2019, 04:40 PM
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906-C Interior Trim Option
906 = Turquoise Cloth
C = Vinyl Custom Sport Front Seat
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Old March 6th, 2019, 04:44 PM
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2KX = Accessory Group 2
Air Conditioning
Floor Mounted Automatic Transmission

5Y = Accessory Group 5
Deluxe Seat Belts
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Old March 6th, 2019, 04:46 PM
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E = Accessory Group 1
Tinted Windshield & Windows
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Old March 6th, 2019, 05:16 PM
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Since it hasn't been broached, yet:
66-33839

66 = 1966 Model Year
3 = Oldsmobile Division
3839 = Cutlass Supreme

Five Oldsmobile 'Cutlass' in model year 1966


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Old March 6th, 2019, 05:31 PM
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OMG!!! Information Overload! I know more now about this Oldsmobile than any other vehicle I have ever owned. So now I spend my breaks at work and at home, checking to see who has schooled me more on my new found classic. Thanks 🤔😁
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Old March 6th, 2019, 05:33 PM
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Just for grins, 30871 sold. Enjoy your car.

Wayne
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Old March 6th, 2019, 05:51 PM
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Welcome, enjoy that 66, they are great cars.
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Old March 6th, 2019, 06:16 PM
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Thanks!😁 Iím sure I will
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Old March 6th, 2019, 09:29 PM
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how original is interior, under hood & trunk? original spare? got pics?
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Old March 6th, 2019, 09:33 PM
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what's the "3D" on the body tag? ….. Electric clock?

& does it have shoulder belts?
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Old March 6th, 2019, 09:39 PM
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looks like it lost its C/S roof emblems when the vinyl top went away


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